Carburetor tester



Jan. 18, 1927. 1,615,000

w. E. THRALL CARBURETOR TESTER Filed Jan 10, 1924 gwuemkot MW E a. 77/541 L Patented Jan. 18, 1927.

uni-ran STATES WAYNE-1E. THRALL, or woncnsrrna, MnssaoH sErIs;

CARBURETOR TESTER? hpplicatioirfiled January 10,1924. SeriaI'NOLnGSSAGG'.

The present invention relates to what I call a carburetor tester and more particularly-to a device for ascertaining whether or not the fuel mixtureof an internalcoma bustioniengine is inproper proportion.

The principal object of the invention is to provide a device of this nature which may be used in conjunction with a cylinder of an internal combustion engine so that when the fuel in the cylinder is ignited the flame will be visible so that one may ascertain by the color of the flame whether or not the fuel mixture is in proper proportion.

Another important object of this invention is to provide a device of this nature in the form of an attachment which may be readily screwed in place of the ordinary pet cocks commonly found upon the cylinder heads of internal combustion engines.

A still further object of the invention is to provide a device of thisfnat-ure having a simple and eflicient construction, one which is reliable, inexpensive to manufacture, durable, and well adapted to the purpose for which it is designed.

With the above and numerous other objects in View as will appear as the description progresses, the invention consists in certain novel features of construction, and in the combination and arrangement of parts as will be hereinafter more fully described and claimed.

In the drawing:

Figure 1 is a sectional view taken through the device, and

Figure 2 is a fragmentary elevation thereof showing the lower portion.

teferring to the drawing in detail it iwill be seen that the body 1 is preferably of a cylindrical formation having its upper end closed by a removable cap 2 threadedly engaged therewith and its lower end permanently closed and provided with a reduced threaded extension 3 for engaging the threaded opening in a cylinder head i wherein is usually disposed a pet cock or the like. 7 This extension 3 is provided with an orifice or conduit 5. The body 1 is divided into an upper chamher (3 and a lower chamber 7 by means of a partition 8. The wall of the lower chamber 7 is broken away to provide the opening 9. The partition 8 is provided with a central aperture through which passes a needle valve 10 one end of which is engag-ed with the orifice-of theiconduit 5' for closing the same. A plunger '11 is. slidably I mounted in the upper chamber 6 and is pressed against the adjacent end-ofthe needle valvelO by means. of a spring 12,- one end of which is impinged against the cap 2. The cap 2 is provided with a threaded opening through which passes a screw 13 so that the same may be engaged against the plunger 11 and prevent the opening of the needle valve 10. hen the screw; 13 is actuated to disengage the plunger 11 the tester is ready for observation when the internal combustion engine is started. The spring 12 is tensioned sufficiently to keep the needle valve 10 in a closed position during the compression stroke of the piston in the cylinder but when the explosion takes place this needle valve will be lifted so that a flame will shoot upwardly through the orifice 5 into the lower chamber 7 of the body 1 and will be visible through the opening 9. By observing the flame it may be readily as certained whether or not the mixture of fuel and air delivered from the carburetor to the explosive chamber of the cylinder is in correctproportions. Thus if there is a proper proportion the flame would be substantially blue but if the mixture was too rich it would be substantially yellow. While the internal combustion engine is being run :the carburetor may be adjusted until the flame visible through the opening 9 is of the proper color and then one would know for certain that the proper mixture of fuel and air was being delivered from the carburetor to the combustion chamber of the cylinder or cylinders of the engine. If the attachment is to be used permanently on the engine the screw 13 maybe operated so as to bear on the plunger 11 and retain the needle valve 10 in a closed position.

It is thought that the construction and. operation of the device will now be readily understood without a more detailed description. WVhile the preferred embodiment of my invention has been disclosed in detail, it will be understood that I do not wish to 105 be limited to the particular construction set forth, since various changes in the form, material, proportions and arrangement of parts and in the details of construction may be resorted to without departing from the 110 spirit and scope of the invention as hereinafter claimed or sacrificing any of its advantages. I

Having thus described my invention, what I claim as new is:

l. A device of the class described including a body having a partition therein dividing the same into two compartments, one of said compartments provided with an opening for observation purposes, an extension formed on the compartment'provided with the observation opening and having an orifice therein communicating with the said compartment, a valve piercing the said partition, means arranged within the compartment of the body not provided with the opening for normally holding the valve in a yieldable closed position, and means for positively holding the valve in a closed position when desired.

2. A device of the class described includ ing a body having a lateral opening for observation purposes and an orifice at right angles thereto communicating therewith, a valve in said body acting to normally close the said orifice, and means loosely engaging said valve for positively holding the same in a closed position when desired.

In testimony whereof I afiix my signature.

WAYNE E. THRALL. 

